required

基本解釋

The police required the traveler to unlock his suitcase.
警察要求這位旅客將手提箱打開。
Jane was the only one who fulfilled all the conditions; she was of the required age, height and colour.
簡是惟一滿足所有條件的人，她具備所要求的年齡、身高和膚色。
A remittance of a large sum is required.
要求一筆大數(shù)額的匯款。
《新英漢大辭典》

His education law,still in effect, required states to show yearly progress in student learning as measured by the states' own tests.
And so when we say something is exponential, we're talking about in terms of the number of bits required to represent it.
所以當我們說某些東西，是指數(shù)增長的我們指的,就是代表它的比特數(shù)。
麻省理工公開課 - 計算機科學及編程導論課程節(jié)選
I think that if a classroom devolves to the point where physical force is required to gain control,
我認為，如果一個課堂秩序十分混亂，以至于要用武力來維持秩序，
反對體罰 - SpeakingMax英語口語達人

So serious was her crime that it required 14 policemen in two vans to arrest her.
UNESCO: Of T-shirts and a vegan commemoration…

If you require something or if something is required, you need it or it is necessary.
If a law or rule requires you to do something, you have to do it.